This is a really interesting zipper using antique techniques for making a zipper. The machine for making these comes out of the industrial age (1880's) where manufacturers were fascinated with little tiny pieces that could be mass produced. Notice that there are little sections of metal that have hooks, that fit into a slot on the other side of the zipper.

They do not run as easily as more modern zippers but the look is absolutely amazing on a leather jacket. They also get better with use.